Drawing-press.



W. KLOCKE.

DRAWING PRESS.

MPPLICATIQN FlL ED MAR 8, I916.

Patented Dec. 5, 1916.

2 SHEETS-SHEET I INVE'NTOR- 07 Q f k'aw W. KLOCKE.

DRAWlNG PRESS.

APPLICATION FILED MAR. 8.1916. 1,206,859. Patented Dec. 5,1916.

' 2 SHEET$'$HEET 2.

Ida .9. v

or to the strippers during this H UN KEE S PATENT QQFFXQE;

@WILLIAM Knocks, OF NEW YORK, N. Y., AssIoNo'R TOE. w. BLISS COMPANY, OF-

nnooxLYN, new YORK,

To-ziZZ w/wmz't ma concern ,Be it known that I, WILLIAM KLookn, acitizcr of the United States of America, residing, in the borough of Brooklyn, county of Kings, in the city and State of New York, have invented certain new and useful Improvements in Drawing-Presses, of which the following is a specification.

My invention relates to presses, ticularly to drawing presses adapted to draw shells of various shapes from metal la ka- In presses of this character if the punch presses the blank directly into the die, the blank is very apt to how out at-its lower part, producing surplus metal 'at the bottom of the stamping which will subsequently have to be pressed out flat. To avoid this a presser-foot has been used which came up and engaged the blank beneath the punch and held the two in firm contact during'the forming operation. The presserfoot WES then pressed up with the Work and punch and acted as a knock-out and discharged the Work from the die when the punch was withdrawn. This caused the stamping to adhere to the punch and it was separated from, the punch'with strippers, frequently causing damage to the stamping operation.

The ohjct of the present invention is to provide a construction of machine wherein thejpresser-foot or blank-holder is caused to firmly clamp thework against the punch or plunger during the drawing operation and prevent the presenceof any surplus metal at the bottom of the stamping. Thereupon, after the plunger is withdrawn from frictional contact with the stampingthe hlankholder, by an independent motion,discharges the stamping from the die.

In carrying this invention into effect my invention consists in providing means wher bythe blank-holder is given. amotion during the. drawing operationin unison with 45 themovement of the plunger, and after the plunger is withdrawn, in giving the blankholder an independent movement the stamping is discharged from the die.

. In the accompanying drawing 1 have illustrated e desirable form in which my in vention. may beembodied.

sidewiew, partly in section of a drawing -press,eontaining my invention; Fig. 2; is

In said drawings Figure ltqrepresents a 4 Specification of Letters Patent. application filed March 8, 1916.

and par preferably whereby ,neijas by a toggle link G.

means of connecting rods I, of

A eonronarzonor WEST VIRGINIA.

DRAVTING-PRESS;

Patented nee. s, 1916. Serial No. 82,850.

an end View thereof, partly in section, on

the line 2-2, Fig. l, the said .figure illustrating the position of the parts at the beginning of the stroke; Fig. 3 is a sectional view similar to the lower part of Fig. 2, illustrating the position of the parts at the eginning of the parts at the completion of the draw-,- mg operation and before the withdrawal of the plunger. Fig. 5 is a similar view illustrating the position of the parts after the and before the hlankholder is elevated to discharge the stamping o plunger is witl'idrawn of the drawing operation; Fig. 4. 1s a similar view illustrating the position lmnnary to the drawing operation, aml

whereby the said blank-holder thereupon moves in unison with the plunger during the drawing operation, during which time the blank is firmly chi n1 pod of the plunger. At the conclusion of the drawing operation the plunger is withdrawn and the l'iiank-holder then remains in the position shown in Fig. 5. Thereupon, after the plunger is withdrawn from frictional contact with the stamping, the blank-holder is given an independent movement by which it acts as a knock-out and discharges the stamping from the die. In carrying the said invention into effect I preferably mount the blank-holder upon a blank-holder frame, which, shown, as a whole, I designate E, and which is composed of two relatively movable parts, to wi an upper frame E upon which the blank-holder C is mounted,

and a. lower: frame E These'two frames are connected by toggles F, of which three are illustrated. The links 01 the toggles are joined together in suitable mansuitably connected to the plunger operating crankshaft l illto be moved therefrom, and this connection may be, accomplished. by

which four are illustrated, by which the said -l lankholder :{rame is connected to the plunger carrying crosshsad J which is driven froi'n The frame E is cranks H on the crank shaft H by pitmen K.

An important part of myinvention resides in the means whereby the toggles F are controlled, so that the blank-holder may move in unison with the plunger during the drawing operation and independently thereof when acting as a knock-out. As illus trated, such means comprise a revolving cam L associated with the crank shaft H, as for instance, by being formed in the driven gear M. This groove is so formed as to give the desired motion to a stationary cam roller N which is located therein and is attached by link U to rocking arm P which is keyed on rocking shaft Q which is journaled in the base of the machine. Fixed upon the shaft Q is a toggle-operating rocking arm R which is provided with a. slot S in which slides a pin T that is suitably fixed upon the toggle link G. p

The operation of the said invention is as follows: In the starting position of the machine, illustrated in Fig. 2, the cranks H are at the upper parts of their path of rotation wherein the plunger A is withdrawn from the work, as illustrated in Figs. 1 and 2. At this time the cam is in a high part of the groove, so that the blank-holder C is substantially in contact with the blank D. Thereupon the crank shaft will revolve counter-clockwise, as seen in Fig. 2, causing the punch to descend until it engages the blank. During this time the cam groove has a slight rise L which straightens the slotted arm R to a vertical position, as seen in Fig. 3, wherein the toggles are straightened. This straightening of the toggles raises the blank holder C as the frame E descends, and causes the same to remain in position against the under side of the blank,'so as to press the same firmly against the plunger when it hits the blank. .During the drawing operation the cam groove has a dwell maintaining the toggles straight and p{ rmitting the frame E carrying the blan -holder to be moved in unison with the plunger by means of the connecting rods I, and the pin T sliding in the slot S enables the blank-holder to move in unison with the plunger and to at all times firmly press the blank against the bottom of the plunger. At the conclusion of the drawing operation the parts are in the position shown in Fig. 4, wherein the plunger has pressed the blank to its desired shape and the pin T is near the bottom of the slot S. A t this time the cranks H are in their lowest position. Thereupon the plunger will be withdrawn, as seen in Fig. 5, and the friction between the stamping and the die being greater than the friction between the plunger and the stamping. the stamping will remain in the die. The crank shaft when itwilhdraws the plunger from frictional contact with the stamping at the structing my invention now known erating means a At this time, however, the cam roller N rides down the fall L in the cam groove, depressing the link U and rocking the shaft Q to break the toggles. as seen inFig. 5, so that the blank-holder does not at this time be to move the blank from out of the die. he frame E, being now in its upper podtion, a continued rotation of the crank shaft will cause the cam roller to ride up on the rise L in the cam groove, strai htening the toggles suliiciently so that the flank-holder acts as a knock-out and discharges the drawn shell from the die. ,At this time the parts are in the position illustrated in Fig. 2, wherein the plunger is withdrawn from the stamping and the toggles are not quite straightened. In the particular construction of press illustrated the crank shaft is located at the upper part of the frame V and the plunger of this is such that the tog les are always a straight when the plunger its the blank, and at this time the slotted connection permit-s the blank-holder to descend with the plunger. The slotted connection in the arm R permits of an adjustment to accomplish a greater break of the toggles when it is desired, in case a deeper stamping is tobe drawn. 0 i

I have illustrated in the accompanying drawings the most desirable manner of conto" me, but the invention is not necessarily limited thereto, as numerous modifications may be made therein and those illustrated employed, within the limits of the appended claims.

What I claim is t 1. In a drawing press, a lun er, 0 rating means then r, a blan -ho der rame, a blank-holder adapted to clamp the work against the plunger, said tblank-holder mounted in shid frame and movable rel! tive thereto, a connection to said 0 nting means for moving sea bllnk-hol er and frame ther, and means; for moving, said blank-ho der relative to its frame, v

2. In a drawi press, a n"; r, operating mearlis there or, ablan {ho ell frame]: a blankolder adapted to 0 amp tie. wor against the plunger. said blank-holder mounted in. sai flame and movable relative thereto. a nnection between said op- (1 said blank-holder frame,

equivalent devices for xvi-- stamping. F 4. In a drawing press,

and means between said operating'means and said blank-holder for moving said blank-holder relative to its, frame,

3. In a drawing blank-holder adapted to clamp the blank against the punch in its working stroke and to be moved as the punch moves, and means for moving the blank-holder to discharge the work from-the die afterthe punch is withdrawn from frictional contact with the a punch, a stationarydie, a blank-holder within said die,

means for causing the blank-holder to clamp the blank against the punch in its working stroke, said means permitting the blankholder to move as the punch moves, and

means for moving the blank-holder to discharge the work from the die after the punch is withdrawn from frictional contact with the stamping.

5. In a drawing press, a plunger, a shaft therefor, a blank-holding frame connected to said plunger, a blank-holder, toggles between said frame and blank-holder, a rocking arm mounted in a fixed part of the press and rocked from said shaft, and having a slotted connection with said (3. Ina drawing press, a plunger, a movable blank-holder frame, a blank-holder adapted to clamp the work against the plunger, said blank-holder mounted in said toggles.

frame and movable relative thereto, means for movin said blank-holder and frame in unison with said plunger, andflmeans for moving said blank-holder relative to said frame out of unison with said plunger.

7. In a drawing press, a movable blankholder frame, a bla-nk holder in said frame,

toggles between said blank-holder and frame, means for operating said toggles,

said blank-holder movable with said frame and adapted to-be moved relatively thereto by said toggles.

'8. In a drawing press, a plunger, a crank shaft therefor, a movable blank -holder frame, a blank-holder in said frame and movable relatively thereto, a connection from said crank shaft to said blank-holder frame for moving the same in unison with the plunger, toggles between the blankholder and frame, and an operating connection thereto from the crank shaft, said blank-holder adapted to be moved relatively to said l'ilank-holding frame and out of unison withtho plunger by said toggles.

9. In a drawing press, a plunger, a crank shaft therefor, a movable blank-holder frame, a blank-holder in said frame and. movable relatively thereto, a connection from said crank shaft to said blank-holder frame for moving the same in unison with the plunger, toggles between the blankholder and frame, and anoperating connection thereto from the crank shaft, co'in-' press, a punch, a die, a

blanloholder, and means for prising'a rockshaft, a rocking arm on said rock shaft adapted to control said toggles, and a connection to said crank shaft. r

10. In a drawing press, a plunger, a

crank shaft therefor,'a movable blank holder frame, a blank-holder in. said frame and said rock shaft from movable relatively thereto, a connection from said crank shaft to said blanleholder frame for moving the same 1n unison with the plunger, toggles between the blankholderand frame, an operating connection thereto from the crank shaft, comprising a rock shaft, a rocking arm on said rock shaft having a slotted connection with the link of said toggles, and a connection to said rock shaft from said crank shaft.

11. In a drawing press, a movable blankholder frame, a blank-holder in said frame,

a plurality of toggles between said blankholderand frame, a bar connecting the links of said toggles, with said frame and adapted to be moved relatively thereto by said toggles.

12. In a drawing press, a plunger, a movable blank-holder frame, a blank-holder in said frame, a pluralitv of toggles between said b1ank-holder and frame, a bar conmeeting the links of said toggles, said blankholder movable with said frame and adapted T a rocking arm having a pin and slot connection with the link of said toggles,

whereby when, said rocklng arm is aimed with the path of movement of said frame it permits movement of said connected frame and rocking said arm whereby said blankholder is moved by said toggles relatively to said frame.

14. shaft therefor, a movable blank-holder frame, a blank-holder in said frame, said blank-holder and frame connected to move in unison with said said blank-holder and frame, means for operating said toggles comprising a rocking arm having a pin and slot connection with the link of said toggles, whereby when said said blank-holder movable plunger, toggles between In a drawing press, a plunger, a crank rocking arm is alined with the path of movement of said frame it permits movement of said connected frame and Y blank-holder, a cam groove associated with said crank shaft V and a cam therein and connections therefrom v to said rock shaft for inoving said blankholder relatively to said frame by said toggles, said. parts so combined and operatilgfi that the blank-holder clamps the bla against the plunger during its working stroke and is moved as the plunger moves,

' a movement in unisen with the plunger during the drawing operation, and means eating after the plunger is withdrawn from fric -x. tional contact with the stamping for giving 15 the blank-holder an independent movement to discharge the stamping.

In witness whereof,- I have hereunto signed my name in the presence of two subscribing witn WILLIAM KLOCKE.

Witnesses:

FRANK OKnizrrn, JOHN D. M. INro. 

